public class Offer_05_2 {
      /*
    请实现一个函数，把字符串 s 中的每个空格替换成"%20"。
    示例 1：
    输入：s = "We are happy."
    输出："We%20are%20happy."
   * */

    public static String replaceSpace(String s) {
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            char ch = s.charAt(i);
            if(ch==' '){
                stringBuilder.append("%20");
            }else{
                stringBuilder.append(ch);
            }
        }
        return stringBuilder.toString();
    }
    public static void main(String[] args) {
        System.out.println(replaceSpace("We are happy."));
    }
}
